/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package id

import (
	"context"
	"testing"
	"time"

	"github.com/apache/incubator-horaedb-meta/server/etcdutil"
	"github.com/stretchr/testify/require"
	clientv3 "go.etcd.io/etcd/client/v3"
	"go.uber.org/zap"
)

const (
	defaultRequestTimeout = time.Second * 30
	defaultStep           = 100
	defaultRootPath       = "/meta"
	defaultAllocIDKey     = "/id"
)

func TestMultipleAllocBasedOnKV(t *testing.T) {
	start := 0
	size := 201
	_, kv, closeSrv := etcdutil.PrepareEtcdServerAndClient(t)
	defer closeSrv()

	testAllocIDValue(t, kv, start, size)
	testAllocIDValue(t, kv, ((start+size)/defaultStep+1)*defaultStep, size)
}

func testAllocIDValue(t *testing.T, kv clientv3.KV, start, size int) {
	re := require.New(t)
	alloc := NewAllocatorImpl(zap.NewNop(), kv, defaultRootPath+defaultAllocIDKey, defaultStep)
	ctx, cancel := context.WithTimeout(context.Background(), defaultRequestTimeout)
	defer cancel()

	for i := start; i < start+size; i++ {
		value, err := alloc.Alloc(ctx)
		re.NoError(err)
		re.Equal(uint64(i), value)
	}
}
